#include<iostream>
using namespace std;
int main()
{
  int a,b;
  char c;
  cin>>a>>b;
  cin>>c;
  if(c=='+')cout<<a+b;
  else if(c=='-')cout<<a-b;
  else if(c=='*')cout<<a*b;
  else if(c=='/')
  {if(b!=0)cout<<a/b;
  else cout<<"Divided by zero!";}
  else cout<<"Invalid operator!";
}